Fix WeakPtrFactory member ordering in chrome/browser

chrome/browser/policy/cloud/user_policy_signin_service_mobile.cc

Index: chrome/browser/policy/cloud/user_policy_signin_service_mobile.cc
diff --git a/chrome/browser/policy/cloud/user_policy_signin_service_mobile.cc b/chrome/browser/policy/cloud/user_policy_signin_service_mobile.cc
index 7f17fc1c9dfbeea276c9e253182a2b0226710ce6..abd580e48b78d1bc9cbe6888c64b2230f827af82 100644
--- a/chrome/browser/policy/cloud/user_policy_signin_service_mobile.cc
+++ b/chrome/browser/policy/cloud/user_policy_signin_service_mobile.cc
@@ -57,9 +57,9 @@ UserPolicySigninService::UserPolicySigninService(
                                   policy_manager,
                                   signin_manager,
                                   system_request_context),
-      weak_factory_(this),
       oauth2_token_service_(token_service),
-      profile_prefs_(profile->GetPrefs()) {
+      profile_prefs_(profile->GetPrefs()),
+      weak_factory_(this) {
 #if defined(OS_IOS)
   // iOS doesn't create this service with the Profile; instead it's created
   // a little bit later. See UserPolicySigninServiceFactory.